CNN’s Piers Morgan tweeted: “Another day, another horrific shooting. America’s gun culture has to change. When will America deal with its gun madness?”

Morgan added, “Any moment now, a gun nut will tweet me saying, ‘If all the kids in that school had been armed, the shooters would have been stopped…”

One person reminded Morgan that White House Press Secretary Jay Carney said, while there is a day to talk about gun-control policy, “today is not that day.”

But Morgan countered, “White House spokesman Jay Carney’s right – today’s not the day to debate gun control. YESTERDAY was the day to debate it.” He also said the tragedy led to what is “now President Obama’s biggest test – will he have the courage to stand up to the American gun lobby?”

In a statement today, President Obama told the nation, “We’re going to have to come together and take meaningful action to prevent more tragedies like this regardless of the politics.”

But New York City Mayor Michael Bloomberg demanded Obama take “immediate action.”

“The country needs him to send a bill to Congress to fix this problem,” Bloomberg said in a statement this afternoon. “Calling for ‘meaningful action’ is not enough. We need immediate action. We have heard all the rhetoric before. What we have not seen is leadership – not from the White House and not from Congress. That must end today. This is a national tragedy and it demands a national response.”

Anti-gun groups planned rallies outside the White House on Friday evening., according to U.S. News & World Report.

The attack has ignited debate on the White House website, where at least six petitions demand gun-control measures.

“Immediately address the issue of gun control through the introduction of legislation in Congress,” states one petition with more than 25,000 signatures at the time of this report.

Current TV host John Fugelsang called for tightened restrictions on gun ownership.

He tweeted: “America likes guns the way the rest of the world likes soccer. Guns don’t kill people. People in states without gun-purchase background checks & waiting periods kill people.”

David Frum, former speech writer for George W. Bush, cracked: “Shooting at CT elementary school. Obviously, we need to lower the age limit for concealed carry so toddlers can defend themselves.”

In a column posted on the Daily Beast, Frum refused to apologize for his tweet, adding: “A permissive gun regime is not the only reason that the United States suffers so many atrocities like the one in Connecticut. An inadequate mental health system is surely at least as important a part of the answer, as are half a dozen other factors arising from some of the deepest wellsprings of American culture.

“Nor can anybody promise that more rational gun laws would prevent each and every mass murder in this country. Gun killings do occur even in countries that restrict guns with maximum severity.

“But we can say that if the United States worked harder to keep guns out of the hands of dangerous people, there would be many, many fewer atrocities like the one in Connecticut.”

New York Times media columnist David Carr said, “If any other plague was leaving piles of dead bodies all over the country, including children, our country would figure it out.”

Actor and director Adam Shankman reminded America about the bloodbath in Aurora, Colo. in his tweet: “This year: CO movie theater, OR mall, and now CT school. How many innocents must die before we enforce more gun control! Prayer for #newton”

The killing spree at the Connecticut elementary school came just months after July’s “Dark Knight Rises” massacre in an Aurora theater.

In reaction to the wave of calls for gun control, former presidential candidate Herman Cain tweeted: “I am disgusted by those who want to get into the politics of today’s violence. Shame on Michael Moore & MSNBC.”

In his appearance on “The O’Reilly Factor,” Geraldo Rivera declared, “I want an armed cop at every school. … We have to protect these children as if they were gold, as if they were the fissionable material in atom bombs.”

He added, “This is the worst thing ever. … It is so unconscionable, it is beyond description. ‘Evil’ doesn’t do it.”

Host Bill O’Reilly replied, “There is an evil in the universe. You can’t stop it. We just have to deal with it. … There’s nothing we can do.”

Who or what do you blame most for the kindergarten massacre?

The fact that firearms are available to private citizens at all

The NRA

The Second Amendment

A culture of violence that desensitizes young people

Lack of mental health services

Gun manufacturers

We don't have enough information to figure it out

I don't know

It's too early to think about that question

I don't blame anyone. History is full of cases in which people have been possessed and done evil things

Schools that don't protect children from armed madmen

Gun-free zones

The shooter

I blame Satan, who unquestionably inhabited the killer and caused him to do this